Year	Percent
1997-01-01	0.66960800000000000
1998-01-01	1.08667000000000000
1999-01-01	6.39228000000000000
2000-01-01	12.34990000000000000
2001-01-01	0.48815699999999995
2002-01-01	0.86521100000000010
2003-01-01	1.95020999999999980
2004-01-01	2.67388000000000000
2005-01-01	2.56792000000000000
2006-01-01	1.96312000000000000
2007-01-01	1.41060000000000000
2008-01-01	1.60211000000000010
2009-01-01	5.89133000000000000
2010-01-01	9.13832000000000000
2011-01-01	9.44609000000000000
2012-01-01	11.94970000000000000
2013-01-01	12.08190000000000000
2014-01-01	16.90000000000000000
2015-01-01	18.27660000000000000
2016-01-01	18.71160000000000000